Curtis, Helena. Biology / [electronic resource] Helena Curtis. - 2d ed. - New York : Worth Publishers, 1975. - xxv, 1065 p. : ill. (some col.) ; 28 cm. Includes bibliographies and index. ISBN: 0879010401 9780879010409 LCCN: 74027183 Subjects--Topical Terms: Biology. LC Class. No.: QH307.2 Dewey Class. No.: 574